7QIO

Homology model of myosin neck domain in skeletal sarcomere


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 9.00 Å
  • Aggregation State: TISSUE 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

Starting Models: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structures from intact myofibrils reveal mechanism of thin filament regulation through nebulin.

Wang, Z.Grange, M.Pospich, S.Wagner, T.Kho, A.L.Gautel, M.Raunser, S.

(2022) Science 375: eabn1934-eabn1934

  • DOI: https://doi.org/10.1126/science.abn1934
  • Primary Citation of Related Structures:  
    7QIM, 7QIN, 7QIO

  • PubMed Abstract: 

    In skeletal muscle, nebulin stabilizes and regulates the length of thin filaments, but the underlying mechanism remains nebulous. In this work, we used cryo-electron tomography and subtomogram averaging to reveal structures of native nebulin bound to thin filaments within intact sarcomeres. This in situ reconstruction provided high-resolution details of the interaction between nebulin and actin, demonstrating the stabilizing role of nebulin. Myosin bound to the thin filaments exhibited different conformations of the neck domain, highlighting its inherent structural variability in muscle. Unexpectedly, nebulin did not interact with myosin or tropomyosin, but it did interact with a troponin T linker through two potential binding motifs on nebulin, explaining its regulatory role. Our structures support the role of nebulin as a thin filament "molecular ruler" and provide a molecular basis for studying nemaline myopathies.


  • Organizational Affiliation

    Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, 44227 Dortmund, Germany.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Myosin-4A [auth L],
B [auth M]
848Mus musculusMutation(s): 0 
UniProt
Find proteins for Q5SX39 (Mus musculus)
Explore Q5SX39 
Go to UniProtKB:  Q5SX39
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UniProt GroupQ5SX39
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Myosin light chain 1/3, skeletal muscle isoformC [auth N],
D [auth O]
188Mus musculusMutation(s): 0 
UniProt
Find proteins for P05977 (Mus musculus)
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UniProt GroupP05977
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Myosin regulatory light chain 2, skeletal muscle isoformE [auth P],
F [auth Q]
169Mus musculusMutation(s): 0 
UniProt
Find proteins for P97457 (Mus musculus)
Explore P97457 
Go to UniProtKB:  P97457
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UniProt GroupP97457
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 9.00 Å
  • Aggregation State: TISSUE 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Max Planck SocietyEuropean Union--
Wellcome TrustEuropean Union201543/Z/16/Z
European Research Council (ERC)European Union856118
Medical Research Council (MRC, United Kingdom)European UnionMR/R003106/1
European Molecular Biology Organization (EMBO)European Union--

Revision History  (Full details and data files)

  • Version 1.0: 2022-02-16
    Type: Initial release
  • Version 1.1: 2022-03-02
    Changes: Database references
  • Version 1.2: 2024-07-17
    Changes: Data collection, Refinement description